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<H1>IBM Visualization Data Explorer Programmer&#39;s Reference</H1>
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<H3><A NAME="HDRDXAT" HREF="progu097.htm#PToC_199">DXAddTask</A></H3>
<A NAME="IDX1534"></A>
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<P><STRONG>Function</STRONG>
Adds a task to the current task Group.
<P><STRONG>Syntax</STRONG>
<PRE><STRONG>
&#35;include &lt;dx/dx.h&gt;
Error DXAddTask(Error(*proc)(Pointer), Pointer arg, int size, double work)
</STRONG>
</PRE>.
<P><STRONG>Functional Details</STRONG>
The task to be added is defined by the following parameters:
<TABLE CELLPADDING="3">
<TR VALIGN="TOP"><TD><P><B><TT><STRONG>proc</STRONG></TT>
</B></TD><TD><P>A pointer to a function that performs the task.
It takes one argument of type <TT><STRONG>Pointer</STRONG></TT>.
</TD></TR><TR VALIGN="TOP"><TD><P><B><TT><STRONG>arg</STRONG></TT>
</B></TD><TD><P>A pointer to an argument block.
</TD></TR><TR VALIGN="TOP"><TD><P><B><TT><STRONG>size</STRONG></TT>
</B></TD><TD><P>The size of the argument block in bytes.
If <TT><STRONG>size</STRONG></TT> is nonzero, the argument block is copied.
Otherwise, the value of <TT><STRONG>arg</STRONG></TT> is passed to
<TT><STRONG>proc</STRONG></TT> without copying, which is useful
for passing integers or Objects.
</TD></TR><TR VALIGN="TOP"><TD><P><B><TT><STRONG>work</STRONG></TT>
</B></TD><TD><P>The estimated amount of time required by the task in
arbitrary units.
</TD></TR></TABLE>
<P>
Tasks are executed, in parallel if possible, by
<TT><STRONG>DXExecuteTaskGroup</STRONG></TT>.
Executing a task consists of calling <TT><STRONG>(*proc)(arg)</STRONG></TT>.
To facilitate load balancing, tasks are executed in order of
decreasing work estimates.
Once <TT><STRONG>DXExecuteTaskGroup</STRONG></TT> has been called, additional
tasks can be created only from other tasks in the current task Group,
and they are run as soon as possible, without regard to
<TT><STRONG>work</STRONG></TT> or the status of the
original tasks.
<P><STRONG>Return Value</STRONG>
Returns <TT><STRONG>OK</STRONG></TT> or returns <TT><STRONG>ERROR</STRONG></TT>
and sets an error code.
<P><STRONG>See Also</STRONG>
<TT><STRONG>
<A HREF="progu098.htm#HDRDXATG">DXAbortTaskGroup</A>,
<A HREF="progu127.htm#HDRDXCTG">DXCreateTaskGroup</A>,
<A HREF="progu138.htm#HDRDXETG">DXExecuteTaskGroup</A>,
<A HREF="progu269.htm#HDRDXPROI">DXProcessorId</A>,
<A HREF="progu270.htm#HDRDXPROC">DXProcessors</A>
</STRONG></TT>
<P>
<A HREF="progu062.htm#HDRPLSM">13.8 , "Parallelism"</A>.
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